Tricholomopsis 'decora group'
Uriarra Village, ACT
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| Tricholomopsis 'decora group' | Heinol | 15 Jan 2026 | |
| Agarics gilled fungi | KenT | 16 Dec 2025 |
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User's notes
Count of fruit bodies around an old stump in four groups. From a distance I thought it may have been an Armillaria. but there is no annulus on the stipe and the caps seem too small.
4 comments
15 Jan 2026
Intriguing. I think this is something akin to the northern hemisphere species Tricholomopsis decora (e.g. see https://www.mushroomexpert.com/tricholomopsis_decora.html for a description).
It would probably be more interesting if this were a species of Desarmillaria - basically a ringless Armillaria and a genus in which the caps can be small. It is widespread in the northern hemisphere and I know of only one claim of it in Australia – a 1989 collection from Queensland and stored under the name Armillaria tabescens in the Brisbane herbarium (see https://avh.ala.org.au/occurrences/f536f6ff-e680-4400-bf36-4da21a91ad47) – and your photos don’t show that species, nor any other Desarmillaria species that I can find photos/descriptions of.
It would probably be more interesting if this were a species of Desarmillaria - basically a ringless Armillaria and a genus in which the caps can be small. It is widespread in the northern hemisphere and I know of only one claim of it in Australia – a 1989 collection from Queensland and stored under the name Armillaria tabescens in the Brisbane herbarium (see https://avh.ala.org.au/occurrences/f536f6ff-e680-4400-bf36-4da21a91ad47) – and your photos don’t show that species, nor any other Desarmillaria species that I can find photos/descriptions of.
21 Jan 2026
I've since seen that the Tasmanian fungal guide by Gates & Ratkowsky includes a photo of a Tricholomopsis that they label 'cf. decora'.
21 Jan 2026
With the Gates & Ratkowsky images of Tricholomopsis neither of their species show widely spaced decurrent gills that are present in the images presented here. I don't know how much weight the old physical characters have in generic and species determination in these times of modern molecular identification.
22 Jan 2026
A Nordic fungal monograph includes the rarely found, yellowish species Tricholomopsis ossiliensis, that keys out in a final couplet alongside decora. That monograph allows five levels of gill spacing – very crowded, crowded, medium spaced, distant, very distant. In both species the gills are described as medium spaced and, for ossiliensis they are noted as adnate or with a short decurrent tooth. These two species are reported on decaying conifer wood and (according to GBIF, with the cf. decora of Tasmania and some environmental DNA from Thailand excluded) they have been reported only from the Northern Hemisphere. So, while I don’t think this is decora, the visual similarity prompted ‘decora group’ as a reasonable pigeonhole. I looked through NatureMapr’s unidentified agarics to see if there were any more sightings of this but didn’t find any.
Location information
- Coordinates 148.817361-35.354611
- Maps Namadgi National Park
- Places Uriarra Village, ACT
Sighting information
- 16 - 100 Abundance
- 16 Jan 2024 12:40 PM Recorded on
- KenT Recorded by
Collections
- KenT NatureMapr Canberra & Southern Tablelands Caps on stems; gills below caps [mushrooms or mushroom-like] Fungi Tricholomopsis 'decora group'
Species information
- Tricholomopsis 'decora group' Scientific name
- Common name
- Not Sensitive
- Cosmopolitan
- Unknown
Record quality
Quality score
5 / 7
- Images or audio
- More than one media file
- Verified by an expert moderator
- GPS evidence of location
- Description
- Nearby sighting(s) of same species
- Additional attributes